#
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

"""
  CLI interface for heat management.
"""

import sys

from oslo.config import cfg

from heat.db import api
from heat.db import utils
from heat.openstack.common import log
from heat import version


CONF = cfg.CONF


def do_db_version():
    """Print database's current migration level."""
    print(api.db_version(api.get_engine()))


def do_db_sync():
    """
    Place a database under migration control and upgrade,
    creating first if necessary.
    """
    api.db_sync(api.get_engine(), CONF.command.version)


def purge_deleted():
    """
    Remove database records that have been previously soft deleted
    """
    utils.purge_deleted(CONF.command.age, CONF.command.granularity)


def add_command_parsers(subparsers):
    parser = subparsers.add_parser('db_version')
    parser.set_defaults(func=do_db_version)

    parser = subparsers.add_parser('db_sync')
    parser.set_defaults(func=do_db_sync)
    parser.add_argument('version', nargs='?')
    parser.add_argument('current_version', nargs='?')

    parser = subparsers.add_parser('purge_deleted')
    parser.set_defaults(func=purge_deleted)
    parser.add_argument('age', nargs='?', default='90',
                        help=_('How long to preserve deleted data.'))
    parser.add_argument(
        '-g', '--granularity', default='days',
        choices=['days', 'hours', 'minutes', 'seconds'],
        help=_('Granularity to use for age argument, defaults to days.'))

command_opt = cfg.SubCommandOpt('command',
                                title='Commands',
                                help='Show available commands.',
                                handler=add_command_parsers)


def main():
    CONF.register_cli_opt(command_opt)
    try:
        default_config_files = cfg.find_config_files('heat', 'heat-engine')
        CONF(sys.argv[1:], project='heat', prog='heat-manage',
             version=version.version_info.version_string(),
             default_config_files=default_config_files)
        log.setup("heat")
    except RuntimeError as e:
        sys.exit("ERROR: %s" % e)

    try:
        CONF.command.func()
    except Exception as e:
        sys.exit("ERROR: %s" % e)
